Creampie scenes depart from heterosexual pornographic convention in favor milf sex videos of a depiction that more closely mimics sexual intercourse as performed in ordinary life; they have been called the counterimage of facials. Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands. Examples of heterosexual pornographic film series featuring creampies include Cream Filled Teens and Internal Cumbustion. Because the viewing of such films carried a social stigma, they were viewed at brothels, adult movie theaters, stag parties, at home, in private clubs and also at night cinemas. The term hentai is never used in this context in Japanese. Jerk off instruction features a performer encouraging or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. For uncircumcised males, stimulation of the penis in this way comes from the pumping of the foreskin, in which the foreskin is held and slid up and down over the glans, which depending on foreskin length, is completely or partially covered and then uncovered in a rapid motion. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. Sometimes special furniture is used, such as a queening stool or smotherbox. If ejaculation is onto the other person face it can be called a facial. Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts , and it was one of the nine substitute exercises for penetrative sexual activities, as detailed in the Paradis Charnels of 1903. Saliva pornography involves salivation and saliva. Reality pornography is professionally made porn which seeks to emulate the style of amateur pornography. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Bobbi S. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease.